/*
 * Copyright (c) 2020, 2025, keyila All rights reserved.
 *
 */
package com.clp.study.Test.FourToFive;

import java.util.HashMap;
import java.util.HashSet;

/**
 * @author clp
 * @version 1.0
 */
public class FourFiveZ {
    public static void main(String[] args) {
        HashSet<String> set=new HashSet<>();
        set.add("A");
        set.add("A");
        set.add("B");
        System.out.println(set.size());
    }
}
